linux-kernel - [PATCH AUTOSEL 5.16 168/217] iwlwifi: pcie: make sure prph

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Message-Id: <20220118021940.1942199-168-sashal@kernel.org>
Date:   Mon, 17 Jan 2022 21:18:51 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Luca Coelho <luciano.coelho@...el.com>,
        Sasha Levin <sashal@...nel.org>, kvalo@...nel.org,
        davem@...emloft.net, kuba@...nel.org, johannes.berg@...el.com,
        mordechay.goodstein@...el.com, emmanuel.grumbach@...el.com,
        michael.golant@...el.com, jkosina@...e.cz, ilan.peer@...el.com,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.16 168/217] iwlwifi: pcie: make sure prph_info is set when treating wakeup IRQ

From: Luca Coelho <luciano.coelho@...el.com>

[ Upstream commit 459fc0f2c6b0f6e280bfa0f230c100c9dfe3a199 ]

In some rare cases when the HW is in a bad state, we may get this
interrupt when prph_info is not set yet.  Then we will try to
dereference it to check the sleep_notif element, which will cause an
oops.

Fix that by ignoring the interrupt if prph_info is not set yet.

Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Link: https://lore.kernel.org/r/iwlwifi.20211219132536.0537aa562313.I183bb336345b9b3da196ba9e596a6f189fbcbd09@changeid
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
index 14602d6d6699f..8247014278f30 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
@@ -2266,7 +2266,12 @@ irqreturn_t iwl_pcie_irq_msix_handler(int irq, void *dev_id)
 		}
 	}
 
-	if (inta_hw & MSIX_HW_INT_CAUSES_REG_WAKEUP) {
+	/*
+	 * In some rare cases when the HW is in a bad state, we may
+	 * get this interrupt too early, when prph_info is still NULL.
+	 * So make sure that it's not NULL to prevent crashing.
+	 */
+	if (inta_hw & MSIX_HW_INT_CAUSES_REG_WAKEUP && trans_pcie->prph_info) {
 		u32 sleep_notif =
 			le32_to_cpu(trans_pcie->prph_info->sleep_notif);
 		if (sleep_notif == IWL_D3_SLEEP_STATUS_SUSPEND ||
-- 
2.34.1